Due to the complex structure of the buildings，such as hydro-junctions，bridges，and spur dikes，along the Beijiang channel，the conventional measurement technologies are difficult to implement and offer low measurement accuracy. To overcome these problems，this study investigates a three-dimensional（3D）laser scanning measurement technology. Relying on a project in a certain section of the Beijiang channel，this study uses the 3D laser scanning technology to obtain high-precision 3D point cloud data of the appearance of aquatic objects along the channel and thereby provide fine topographic maps for channel capacity expansion and upgrading design. Then，it builds a 3D visual model，providing fine and rich surveying and mapping result data for the building information modeling（BIM）design of the project the study relies on. The results show that the 3D laser scanning technology can provide rich surveying and mapping results for channel design and thus offers favorable technical advantages.